JOINING DEVICE

A joining device includes a first roller that rotates an attached first workpiece in the conveying direction to convey the first workpiece, and a second roller that rotates the attached second workpiece in the conveying direction to join the second workpiece to the conveyed first workpiece by heat. The second roller includes a main body drum, a plurality of protruding portions provided at intervals in the rotational direction of the main body drum, and a plurality of suction portions that is provided to each of the protruding portions and attaches a second workpiece onto end surfaces of the protruding portions.